Lutron Radio Touch RTA-RS232 Guide D'installation Et De Mise En Service page 11

Protocol (continued)
In addition, if the RTA-RS232 is in Configuration
Mode and Reply Back Mode is on, the RTA-
RS232 will echo back the last command upon
successful completion. For instance, if Zone 1 is to
be configured as lights; the following data is
transferred
Host :CON,TYPE,1,L<CR>
RTA-RS232 ~CON,RPT,TYPE,1,L<CR>
If the command is not successfully processed by
the RTA-RS232, it will respond to the host with:
~ERROR,error number<CR>
See Error Codes on page 15 for a list of error
numbers and error descriptions. The default setting
for Reply Back Mode is ON.
Acknowledge
The RTA-RS232 has the ability to inform the host
when it has completed RF transmission of an
RS232 command. This mode can be turned on or
off. After completing RF transmission, the RTA-
RS232 will respond to the host with:
~ACK<CR>
The default setting for Acknowledge Mode is OFF.
ADD/DELETE RTA-RS232
Each utilized zone of the RTA-RS232 needs to be
addressed to the RF controller(s) it is intended to
control. See the RadioTouch Installer's Guide for
information on addressing.
R
Data Flow Control
The RTA-RS232 Interface can only accept one
command at a time. When it is done processing
this command, it will inform the host it is ready to
receive more data. The method by which it informs
the host depends whether it is using Hardware
Handshaking, Software Flow Control or No Flow
Control.
Hardware Handshaking
The RadioTouchTM RS232 interface supports full
hardware handshaking. In this mode, the system
utilizes TX, RX, CTS, RTS, DTR, DSR, and Ground.
Software Flow Control
If hardware handshaking is not being used, care
must be taken to ensure all messages are
captured. Once the Host issues a command, it
cannot issue another one until the RTA-RS232
issues a prompt "!" (ASCII 33d).
No Flow Control
In No Flow Control Mode the RTA-RS232 will not
provide any indication that it is able to receive
more data from the host. In order to prevent
messages from being lost, the host must ensure
that each message transmitted to the RTA-RS232
is separated by at least 400ms. No Flow Control is
the default setting.
RadioTouch RTA-RS232 Programming and Operation Guide
TM
11